420 



INDEX — GLOSSARY 



Cranids, 192. 



Cranium, that part of the skull which 

 immediately incloses the brain ; the 

 brain case. 



Crawling legs, in trilobites, 288. 



Crayfish, 275, 276, 307 ; see also Cam- 

 bar us ; ancestry of, 307. 



Creodonta, 379, 380; closely related to 

 Eocene insect ivores and ungulates, 

 379 ; geologic range of, 379. 



Creodonts, the Creodonta. 



Cretaceous, 407. 



Cretaceous fossils figured, iq, 47, yg, 

 202, 224, 266, 267, 268, 357, 364, 

 366, 367, 372. 



Crickets, 318. 



Crinoidal limestone, 159. 



Crinoidea, 159-163 ; see also crinoids and 

 Pentacrinus. 



Crinoids, 159-163; fossils of, 160-163; 

 geologic range of, 159, 409. 



Crocodiles, 365 ; food per day, 361 ; 

 geologic range of, 365. 



Crocodilia, 365 ; see also crocodiles. 



Crop, in birds, 369. 



Crossopterygii, 345; fins in, 340; gen- 

 eralized order, 345 ; geologic range of, 

 345 ; probable relationship to the 

 Stegocephalia, 352. 



Crura, 185, 185. 



Crustacea, 275-308; antennae of, 276, 

 27Q, 286; brain of, 27Q, 282; caecum 

 of, 27 Q ; chitin of, 284-285 ; circula- 

 tion of, 285 ; digestion, etc., see Cam- 

 bar us, A pus; digestive gland of, 27 g; 

 dorsal muscles of, 278; evolution of, 

 274; extensor muscles of, 278, 27 g; 

 eye of, 276, 27g, 286; flexor muscles 

 of, 278, 27g ; food of cephalopods, 256 ; 

 food of squids, 270 ; foot jaws of, 27g ; 

 fossils of, 285-307 ; gastric mill of, 

 27Q ; geologic range of, 409 ; heart 

 of, 27g; intestine of, 279; pericar- 

 dium of, 27g ; respiration of, 285 ; 

 secretive and absorptive division of 

 digestive canal of, 285 ; skeleton, 

 external, 276, 279; skeleton, internal, 

 279 ; survey of, 284-285 ; telson of, 

 276, 276, 27g ; ventral muscles of, 278 ; 

 ventral nerve cord, 279 ; walking legs 

 of, 276, 27g. 



Crustaceans, see Crustacea. 



Cryptogams, cellular, 45 ; vascular, 45. 

 Cryptozoon, 37, 38; C. bassleri, 37; 



C. prolijerum, 37. 

 Ctenidia, in mollusks, 206. 

 Ctenophora, 139 ; geologic range of, 409 

 Cuboides bone in the cat, 327. 

 Cud, development of chewing the, 397. 

 Cumacea, 306. 



Cuneiform bone, of cat, 327; of mam- 

 mals, 3g5. 

 Cupresseae, 74. 

 Cuttle bone, 272. 



Cycadales, 60-67 ; geologic range of, 408. 

 Cycadeae, 66. 

 Cycadeoidea, 65 ; C. colossalis, 65 ; C. 



dacotensis, 63, 64 ; C. jenneyana, 62 ; 



C. marylandica, 61. 

 Cycadeoideae, 60-66; in evolution, 63. 

 Cycadeoids, the Cycadeoideae. 

 Cycadofilicaleans, see Cycadofilicales. 

 Cycadofilicales, 57-60, 350 ; geologic 



range of, 408. 

 Cycads, 66 ; age of, 66 ; fertilization of, 



66 ; male cells motile, 66. 

 Cycas, reproduction in, 66. 

 Cyclops, 304. 



Cyclostomata, 337; 5ee cyclostomes. 

 Cyclostomes, 337; fossil, 337 ; geologic 



range of, 409 ; respiration in, 341. 

 CyprcEa, 243 ; anal siphon of, 246 ; 



mantle in, 243. 

 Cypris, 303. 

 Cypris stage, 305. 

 Cyrenidae, 221. 

 Cystoidea, 154-157; calyx, etc., see 



cystoids. 

 Cystoids, 154-157; ambulacra of, 154; 



calyx plates of, 154 ; geologic range of, 



409; in evolution, 154. 



Daddy longlegs, 316; trilobite, 288. 



Dead men's fingers, 128. 



Decapoda, 307-308; abdomen, etc., 

 see decapods. 



Decapods, 307-308 ; abdomen of, 307 ; 

 examples of, 307-30S ; food of cepha- 

 lopods, 256; geologic range of, 307. 



Decay, of plants and animals, 5. 



Deer, 397, 398; extinction of, 376; 

 habitat of, 374 ; red, arrival in North 

 America, 375 ; white-tailed, in North 

 America, 375. 



